CN103634054A - Linear damage compensation and polarization de-multiplexing method for high-speed coherent receiving system - Google Patents
Linear damage compensation and polarization de-multiplexing method for high-speed coherent receiving system Download PDFInfo
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Abstract
The invention discloses a linear damage compensation and polarization de-multiplexing method for a high-speed coherent receiving system. The method comprises the following steps: S1, adding new nodes, and calculating tap coefficients and storing the coefficients; S2, an initialization stage; S3, a working stage; S4, performing optical power monitoring on receiving signals by use of an optical power monitoring module so as to determine that the sending of an emergent packet ends; and S5, a control module, according to power monitoring module output information, performs clearing and reset operation on a DSP module and waits to process a next emergent packet. According to the linear damage compensation and polarization de-multiplexing method for the high-speed coherent receiving system, during a processing process, network nodes perform tap modular switching at different emergent time slots through a control module so that emergent packet information sent by different nodes can obtain relevant link damage compensation and polarization de-multiplexing, thus at the time when emergent package signal convergence overhead is reduced, emergent packet information processing time can also be effectively saved.
Description
Technical field
The present invention relates to optical communication technique field, particularly a kind of compensation of the linear damage for high speed coherent reception system and polarization demultiplexing method.
Background technology
Along with developing rapidly of China the Internet, the consumption business of high bandwidth is progressively emerged in large numbers, and bandwidth speed-raising becomes active demand.The introduction of high speed coherent optical communication technology, has solved the demand of network to bandwidth, has realized the lifting of network rate and capacity.But the lifting of network rate makes some can not ignore in the insignificant link adverse effect of idling slow speed system, for example, link dispersion and the adverse effect of polarization rotation to signal.At present, in High Speed System, generally adopt Digital Signal Processing (DSP) module to carry out electric numeric field data processing, compensated chain path loss wound.Wherein, the impact of link dispersion and polarization rotation, compensates by electric territory dispersion compensation mechanism.For example, in DSP module, can adopt CMA algorithm to realize dispersion compensation and polarization demultiplexing function.
For the High Speed System under burst mode, time division multiplexing passive optical-fiber network (TDM-PON) system that is for example concerned with at a high speed and light burst transport network (OBTN) system, the burst packets information transmitting between each node, the optical fiber link length of its experience is different, and suffered link load size is also different.When receiving terminal carries out signal recovery, DSP module parameter arranges needs initialization.In order to reduce the design difficulty of using the burst optical device that burst receiving mode receives, prior art is all to guarantee that by range finding the burst packets of each source node arrives destination node within the set time of its regulation, thereby produce reset signal, burst is received to the optical device setting that resets.But for high speed coherent optical communication system, the time requirement that sun adjuster part produces reset signal improves, optical device burst is processed and is realized difficulty increase.How reducing the burst packets processing time, is that high speed coherent optical communication system is efficiently realized one of the problem receiving required solution that happens suddenly.
In addition, in high speed coherent optical communication system, burst receives to be processed and has higher requirement DSP.For example, the compensate of frequency deviation algorithm in DSP module (biquadratic frequency deviation algorithm for estimating) and skew backoff algorithm (V-V algorithm), be all with respect to character rate, to be to design on the slow basis becoming based on frequency deviation variation and skew variation.For prominent transmitting/receiving signal, the corresponding frequency deviation information of different burst packets and skew information are all suddenlyd change, and traditional compensate of frequency deviation algorithm and skew backoff algorithm can not be correct carries out compensate of frequency deviation and phase offset compensation.The processing that how to make receiving terminal DSP algorithm can adapt to fast burst is also an open question still at present.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, a kind of high speed coherent reception system linear damage compensation and polarization demultiplexing method are provided, make digital signal processing module can well adapt to the work for the treatment of of burst, thereby can realize the high-speed receiving to bursty data in high speed coherent optical communication system.
(2) technical scheme
The invention provides a kind of compensation of the linear damage for high speed coherent reception system and polarization demultiplexing method, comprise the following steps:
S1: new node adds, destination node is utilized the training sequence of new node transmission and is calculated in conjunction with tap coefficient algorithm the tap coefficient that different source nodes are corresponding, and by this calculated value storage;
S2: before each source node burst packets information arrives destination node, destination node is carried out coefficient initialization to each tap coefficient in S1;
S3: destination node is utilized the suffered linear damage compensation of the tap coefficient isostatic compensation burst packets data message after the initialization in S2 and carried out polarization demultiplexing simultaneously;
S4: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that burst packets sends end;
S5: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
Wherein, in S1, described tap coefficient computational process comprises the steps:
S1.1: utilize adaptive equalization algorithm, large convergence step-length is set, carry out fast uniform convergence;
S1.2: when mean square error is less than setting threshold, reduce to restrain step-length, follow the tracks of balanced convergence, be judged to be balanced convergence simultaneously, and tap coefficient corresponding to this moment stored.
Wherein, wherein S3 comprises the steps:
S3.1: read the affiliated corresponding tap coefficient of source node of burst packets, and the tap coefficient of adaptive balance module in digital signal processing module is carried out to initialization;
S3.2: combining adaptive equalization algorithm, carries out to received signal adaptive line damage compensation and polarization demultiplexing and processes, fast the adverse effect of compensation of dispersion and polarization mode dispersion.
Wherein, in S4, when described Optical Power Monitor Module detects power and drops to power threshold, judging that burst packets sends finishes, and decision signal is transferred to described control module simultaneously.
Wherein, in S5, described control module receives the decision signal that described power monitoring module sends, and produces zero clearing and reset signal, frequency deviation estimating modules in described digital signal processing module and phase estimation module are carried out to reset and the zero clearing of parameter, with etc. pending next burst packets.
The present invention also provides a kind of compensation of the linear damage for TDM-PON up-link and polarization demultiplexing method, comprises the following steps:
Under A:OLT, pass authorization message to each ONU, the time window that the ONU newly adding provides according to OLT, uploads training sequence to OLT, and described OLT calculates the tap coefficient of adaptive balance module and stores result of calculation according to training sequence;
B: described OLT passes down authorization message again to this new ONU, and utilize the tap coefficient result of calculation deinitialization tap coefficient of storing;
C: utilize the tap coefficient after the initialization of step B correctly to receive the registration request frame that optical node is uploaded;
D: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that registration request frame sends end;
E: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
The present invention also comprises a kind of for OBTN system linearity damage compensation and polarization demultiplexing method, comprises the following steps:
I: the physical connection of change new node, start the operation of master control node, in range finding statistics network topology from nodes, according to number of network node, make bandwidth map, and transmit training sequence and calculate tap coefficient according to described bandwidth map, by the preservation corresponding to respective sources node address of gained tap coefficient;
II: utilize the tap coefficient in tap coefficient calculated value initialization digital signal processing module;
III: burst data communication;
IV: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that bursty data sends end;
V: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
Wherein, in steps A, described training sequence need send before registration request frame.
(3) beneficial effect
High speed coherent reception system linear damage compensation of the present invention and polarization demultiplexing method, in processing procedure, network node carries out the switching of tap coefficient by control module at difference burst time slot, the burst packets information that different nodes are sent all can obtain the compensation of link damage targetedly and polarization demultiplexing, when reducing burst packets convergence signal expense, can also effectively save burst packets message processing time.
Accompanying drawing explanation
Fig. 1 is high speed coherent reception system linear damage compensation of the present invention and polarization demultiplexing method step flow chart;
Fig. 2 is the present invention's star-like structure chart in high speed coherent optical communication system;
Fig. 3 is the present invention's ring network structure chart in high speed coherent optical communication system;
Fig. 4 is the present invention's DSP functions of modules structure chart in high speed coherent optical communication system;
Fig. 5 is the present invention's ONU registration step flow chart in high speed TDM-PON system;
Fig. 6 is the present invention's ONU request registration frame assumption diagram in high speed TDM-PON system;
Fig. 7 is that the present invention's initial tap coefficient in high speed TDM-PON system calculates and Stored Procedure figure;
Fig. 8 be the present invention in high speed OBTN system from node registration step flow chart;
Fig. 9 is the present invention's bandwidth map schematic diagram in high speed OBTN system;
Figure 10 is that the present invention's initial tap coefficient in high speed OBTN system calculates and Stored Procedure figure;
Figure 11 is the inventive method application structure figure in embodiment 140G PM-QPSK TDM-EPON system;
Figure 12 is the inventive method application structure figure in embodiment 240G PM-QPSK OBTN system.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, the invention provides a kind of compensation of the linear damage for high speed coherent reception system and polarization demultiplexing method, comprise the following steps:
S1: new node adds, destination node is utilized the training sequence of new node transmission and is calculated in conjunction with tap coefficient algorithm the tap coefficient that different source nodes are corresponding, and by this calculated value storage;
S2: before each source node burst packets information arrives destination node, destination node is carried out coefficient initialization to each tap coefficient in S1;
S3: destination node is utilized the suffered linear damage compensation of the tap coefficient isostatic compensation burst packets data message after the initialization in S2 and carried out polarization demultiplexing simultaneously;
S4: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that burst packets sends end;
S5: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to DSP module, waits for next burst packets is processed.
Wherein, in S1, described tap coefficient computational process comprises the steps:
S1.1: utilize adaptive equalization algorithm, large convergence step-length is set, carry out fast uniform convergence;
S1.2: when mean square error is less than setting threshold, reduce to restrain step-length, follow the tracks of balanced convergence, be judged to be balanced convergence simultaneously, and tap coefficient corresponding to this moment stored.
Wherein S3 comprises the steps:
S3.1: read the affiliated corresponding tap coefficient of source node of burst packets, and the tap coefficient of adaptive balance module in DSP module is carried out to initialization;
S3.2: combining adaptive equalization algorithm, carries out to received signal adaptive line damage compensation and polarization demultiplexing and processes, fast the adverse effect of compensation of dispersion and polarization mode dispersion.
In S4, when described Optical Power Monitor Module detects power and drops to power threshold, judging that burst packets sends finishes, and decision signal is transferred to described control module simultaneously.
In S5, described control module receives the decision signal that described power monitoring module sends, and produce zero clearing and reset signal, the frequency deviation estimating modules in described DSP module and phase estimation module are carried out to reset and the zero clearing of parameter, with etc. pending next burst packets.
The method of the invention can be applicable to point-to-point configuration, as shown in Figures 2 and 3, is Star Network and loop network.The burst that uses adaptive equalizer to send source node in destination node carries out adaptive line damage compensation and polarization demultiplexing is processed.In conjunction with equalizer, for tap coefficient adjustment algorithm, destination node utilizes training sequence before source node data communication, to carry out the calculating of tap coefficient, thereby obtains the tap coefficient that different source nodes are corresponding, and by this calculated value storage.When system is started working, before the burst packets information of each source node arrives destination node, the tap coefficient of destination node utilization storage carries out coefficient initialization to each tap coefficient of balance module, thereby can compensate targetedly the suffered dispersion of burst packets that different source nodes send and carry out polarization demultiplexing simultaneously.At each source node, transmit in the process of burst packets, without sending again the calculating of training sequence for tap coefficient, thereby greatly saved expense.
Burst of the present invention receives, and utilizes Optical Power Monitor Module to carry out to received signal luminous power detection.When signal light power amplitude drops to below power threshold, judge that burst packets sends end.
The method of the invention comprises the modification to frequency deviation estimating modules and skew estimation module.In this burst packets, finish, before next burst packets arrives, to the clear operation that resets of frequency deviation estimating modules and skew estimation module, thereby make next burst packets reach rear module, can carry out immediately the DSP of signal and process.
DSP modular structure of the present invention as shown in Figure 4, receives described burst, increases by a control module, by described Optical Power Monitor Module feedback light power information, produces a decision signal, to the clear operation that resets of each functional module in DSP module.
As shown in Figure 5, the invention provides a kind of compensation of the linear damage for TDM-PON up-link and polarization demultiplexing method, comprise the following steps:
A:OLT(optical line terminal) pass down authorization message to each ONU(optical network unit), the time window that ONU provides according to OLT, upload training sequence to OLT, described OLT calculates the tap coefficient of adaptive balance module and stores result of calculation according to training sequence;
B: described OLT passes down authorization message again to this new ONU, and utilize the tap coefficient result of calculation deinitialization tap coefficient of storing;
C: utilize the tap coefficient after the initialization of step B correctly to receive the registration request frame that optical node is uploaded;
D: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that registration request frame sends end;
E: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
In TDM-PON up-link, ONU is identical with the concept of optical node in S1.
Wherein, in steps A, described training sequence need send before registration request frame.
In described TDM-PON up-link application, OLT carries out the switching of tap coefficient at different ascending time slots by described control module, and the burst packets information that different ONU are sent all can obtain linear damage compensation and polarization demultiplexing.
OLT by under teach power to each ONU, when having new ONU to add network, the time window that it provides according to OLT, uploads training sequence to OLT.OLT receives after training sequence, carries out the calculating of tap coefficient, and stores result of calculation.After this step completes, OLT resends so far ONU of authorization message, completes ONU registration.Automatically find from traditional ONU that register flow path is different and be, in the present invention, OLT, before receiving and newly adding the registration request effective information of ONU, just need to complete tap coefficient calculating and the storage operation of adaptive balance module.Therefore,, before training sequence of the present invention is sent in ONU registration request, structure of time slot as shown in Figure 6.
Training sequence length of the present invention is determined by the ONU characteristic of channel of transmission range farthest.Complete after the calculating and storage operation of tap coefficient the information of the reception registration request that OLT could be correct.After tap coefficient has calculated, tap coefficient can be identified to the parameter of ONU arbitrarily with this ID of ONU ID() corresponding preservation, thus, when subsequent burst package informatin arrives, can directly carry out reading of tap coefficient by ONU ID.
As shown in figure 11, a kind of compensation of the linear damage for 40G PM-QPSK TDM-EPON system and polarization demultiplexing method, 40G PON system adopts up-downgoing symmetrical structure, and all adopt the modulation of PM-QPSK form, OLT downlink broadcast authorization message, when having new ONU registration, in the time window information sending at OLT, ONU sends training sequence to OLT, and OLT utilizes this training sequence to calculate the tap coefficient of adaptive balance module, and result of calculation is stored.Then OLT again send comprise time window information mandate frame to this ONU, and according to control protocol, complete the automatic discovery registration process of new ONU, and tap coefficient preservation corresponding to ONU ID the most at last, the tap coefficient initialization procedure of processing for subsequent burst bag.
As shown in Figure 7, the computational process of initial tap coefficient is as follows:
S7.1:OLT sends authorization message to ONU, authorizes ONU to register;
S7.2:ONU receives after registed authorization, in the time slot distributing, to OLT, sends training sequence;
S7.3:OLT receives after training sequence, according to tap coefficient adjustment algorithm, calculates tap coefficient, and preserves;
S7.4:OLT again send comprise time window information mandate frame to this ONU, and utilize control protocol to continue the automatic discovery registration process of new ONU, when receiving ONU id information, it is saved in control module with tap coefficient calculated value is corresponding.
In TDM EPON, OLT decides ONU to authorize according to ONU bandwidth request situation, then notifies ONU by downstream grants, so OLT knows the corresponding ONU of different ascending time slots.Before ONU sends burst packet, OLT utilizes control module to carry out time slot switching, the corresponding tap coefficient of ONU under burst packets is read, and the tap coefficient of initialization equalization filter.In burst transmit process, Optical Power Monitor Module is carried out optical power monitoring.Control module produces a reset signal according to the feedback information of Optical Power Monitor Module, to the clear operation that resets of partial parameters in DSP module, makes DSP module can adapt to fast the data processing of next burst packets.
OLT of the present invention carries out the switching of tap coefficient by control module at difference burst time slot, and the burst packets information that different ONU are sent all can obtain link linear damage compensation targetedly and polarization demultiplexing.When reducing burst convergence expense, can also effectively reduce the cost of access net system.
As shown in Figure 8, it is a kind of for OBTN system linearity damage compensation and polarization demultiplexing method that the present invention also provides, and comprises the following steps:
I: the physical connection of change new node, start the operation of master control node, in range finding statistics network topology from nodes, according to number of network node, make bandwidth map, and transmit training sequence and calculate tap coefficient according to described bandwidth map, by the preservation corresponding to respective sources node address of gained tap coefficient;
II: utilize the tap coefficient in tap coefficient calculated value initialization digital signal processing module;
III: burst data communication;
IV: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that bursty data sends end;
V: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
In described OBTN coherent reception system application, master control node transmits data control information to all the other node control modules by signaling channel, thereby at different time-gap, carry out the switching of tap coefficient, the burst packets information that different nodes are sent all can obtain linear damage compensation and polarization demultiplexing.
For OBTN burst system, the register flow path that new node adds network as shown in Figure 8.After new node and network topology loop physical connection complete, master control node starts operation, knows that network is from nodes and network topology parameter.Master control node is known after network topology nodes, according to network topology nodes, formulates and authorizes equally distributed default bandwidth map, to complete each network node, directly carries out the initialization procedure of two-way communication.Its bandwidth map as shown in Figure 9.
Before topological network data information, each node carries out the transmission of training sequence according to this bandwidth map.The length of training sequence is determined by the characteristic of channel between two nodes of transmission range farthest.Because the mandate between default bandwidth ground node of graph is even, each node carries out a two-way communication to all having an opportunity, and according to the training sequence receiving, completes the initial calculation of tap coefficient.After tap coefficient has calculated, the corresponding preservation of source, destination address by tap coefficient and bandwidth map the inside, generates tap coefficient matrix.Thus, when subsequent burst package informatin arrives, node can directly carry out reading of tap coefficient by tap coefficient matrix.
As shown in figure 12, the compensation of a kind of linear damage for 40G PM-QPSK OBTN system and polarization demultiplexing method, structure in the form of a ring between each node of 40G PM-QPSK OBTN system.When having new node to add loop network, first carry out the change of physical connection.After physical connection has changed, master control node starts operation, utilizes range finder to make in network from nodes, and formulates default bandwidth map.Each node transmits training sequence according to default bandwidth map, and carries out the calculating of tap coefficient, and result of calculation is saved as to tap coefficient matrix, the tap coefficient initialization procedure of processing for subsequent cycle burst packets.
Flow process is consistent as shown in figure 10, and the computational process of initial tap coefficient is as follows:
S10.1: new node carries out the change of physical connection;
S10.2: after having changed, master control node starts operation, and in the statistics network topology of finding range from nodes;
S10.3: master control node is made default bandwidth map according to nodes;
S10.4: each node transmits training sequence according to bandwidth map;
S10.5: each node is received after training sequence, calculates tap coefficient according to tap coefficient adjustment algorithm, and result of calculation is saved as to tap coefficient matrix.
In OBTN, master control node is according to reporting bandwidth request to carry out allocated bandwidth from node, so host node is determined the transmission time slot that different nodes are right.Before burst packets arrives destination node, master control node transmits time slot by control channel and sends information to destination node.Each destination node is carried out time slot switching by control module, the corresponding tap coefficient of source node under burst packets read, and the tap coefficient of initialization equalization filter.In burst transmit process, Optical Power Monitor Module is carried out optical power monitoring.Control module produces a reset signal according to the feedback information of Optical Power Monitor Module, to the clear operation that resets of partial parameters in DSP module, makes DSP module can adapt to fast the data processing of next burst packets.
Network node of the present invention carries out the switching of tap coefficient by control module at difference burst time slot, and the burst packets information that different nodes are sent all can obtain the compensation of link damage targetedly and polarization demultiplexing.When reducing burst packets convergence signal expense, can also effectively save burst packets message processing time.
The present invention can be applicable to TDM PON up direction, to its burst receiving mode, can well adapt to.But the method for the invention is not limited to TDM-PON system.
The present invention can be applicable to light burst transport network, and burst between its each node is transmitted to data can well be adapted to.But the method for the invention is not limited to light burst transport network.
Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. for linear damage compensation and the polarization demultiplexing method of high speed coherent reception system, it is characterized in that, comprise the following steps:
S1: new node adds, destination node is utilized the training sequence of new node transmission and is calculated in conjunction with tap coefficient algorithm the tap coefficient that different source nodes are corresponding, and by this calculated value storage;
S2: before each source node burst packets information arrives destination node, destination node is carried out coefficient initialization to each tap coefficient in S1;
S3: destination node is utilized the suffered linear damage compensation of the tap coefficient isostatic compensation burst packets data message after the initialization in S2 and carried out polarization demultiplexing simultaneously;
S4: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that burst packets sends end;
S5: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
2. the method for claim 1, is characterized in that, in S1, described tap coefficient computational process comprises the steps:
S1.1: utilize adaptive equalization algorithm, large convergence step-length is set, carry out fast uniform convergence;
S1.2: when mean square error is less than setting threshold, reduce to restrain step-length, follow the tracks of balanced convergence, be judged to be balanced convergence simultaneously, and tap coefficient corresponding to this moment stored.
3. the method for claim 1, is characterized in that, wherein S3 comprises the steps:
S3.1: read the affiliated corresponding tap coefficient of source node of burst packets, and the tap coefficient of adaptive balance module in digital signal processing module is carried out to initialization;
S3.2: combining adaptive equalization algorithm, carries out to received signal adaptive line damage compensation and polarization demultiplexing and processes, fast the adverse effect of compensation of dispersion and polarization mode dispersion.
4. the method for claim 1, is characterized in that, in S4, when described Optical Power Monitor Module detects power and drops to power threshold, judging that burst packets sends finishes, and decision signal is transferred to described control module simultaneously.
5. the method for claim 1, it is characterized in that, in S5, described control module receives the decision signal that described power monitoring module sends, and produce zero clearing and reset signal, frequency deviation estimating modules in described digital signal processing module and phase estimation module are carried out to reset and the zero clearing of parameter, with etc. pending next burst packets.
6. for linear damage compensation and the polarization demultiplexing method of TDM-PON up-link, it is characterized in that, comprise the following steps:
Under A:OLT, pass authorization message to each ONU, the time window that the ONU newly adding provides according to OLT, uploads training sequence to OLT, and described OLT calculates the tap coefficient of adaptive balance module and stores result of calculation according to training sequence;
B: described OLT passes down authorization message again to this new ONU, and utilize the tap coefficient result of calculation deinitialization tap coefficient of storing;
C: utilize the tap coefficient after the initialization of step B correctly to receive the registration request frame that optical node is uploaded;
D: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that registration request frame sends end;
E: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
7. for OBTN system linearity damage compensation and a polarization demultiplexing method, it is characterized in that, comprise the following steps:
I: the physical connection of change new node, start the operation of master control node, in range finding statistics network topology from nodes, according to number of network node, make bandwidth map, and transmit training sequence and calculate tap coefficient according to described bandwidth map, by the preservation corresponding to respective sources node address of gained tap coefficient;
II: utilize the tap coefficient in tap coefficient calculated value initialization digital signal processing module;
III: burst data communication;
IV: utilize Optical Power Monitor Module to carry out to received signal optical power monitoring, thereby judge that bursty data sends end;
V: control module, according to power monitoring module output information, is carried out zero clearing and reset operation to digital signal processing module, waits for next burst packets is processed.
8. method as claimed in claim 6, is characterized in that, in steps A, described training sequence need send before registration request frame.
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